1091844 has 36 divisors (see below), whose sum is σ = 2973516. Its totient is φ = 335808.

The previous prime is 1091843. The next prime is 1091863. The reversal of 1091844 is 4481901.

It can be written as a sum of positive squares in 2 ways, for example, as 260100 + 831744 = 510^2 + 912^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (1091843) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 699 + ... + 1634.

2^1091844 is an apocalyptic number.

It is an amenable number.

1091844 is an abundant number, since it is smaller than the sum of its proper divisors (1881672).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1091844 is a wasteful number, since it uses less digits than its factorization.

1091844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2356 (or 2351 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 1091844 is about 1044.9133935403. The cubic root of 1091844 is about 102.9722487841.

It can be divided in two parts, 109 and 1844, that added together give a triangular number (1953 = T₆₂).

The spelling of 1091844 in words is "one million, ninety-one thousand, eight hundred forty-four".